Ok guys, I've managed to solve the problem. I discarted cmos battery, therefore on startup system leeded me to bios menu:
first by pressing F1 and then F2
I know that problem was solved but I found a complete guide BIOS aces for all type of PC here: pcsupport.about.com/od/fixtheproblem/a/biosaccess_pc.htm . Maybe will help someone else .
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Marked Solved 
. Glad you got it sorted. 
